Add effect metadata

Effect metadata is a means to store additional user-defined data for the effect,
which can be reused when the cancel function of the effect is called.
This commit also adds a new example (blind) to demonstrate usage of that.
This commit is contained in:
Wuzzy
2014-07-14 17:28:51 +02:00
parent a91e4c79ce
commit 21f053270f
3 changed files with 30 additions and 4 deletions

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